Chart-display apparatus.



AYPLIO ATION FILED JAN. 11, 1906.

G. .H. GONGDON.

CHART DISPLAY APPARATUS.

mmm i 2X ll -mcaoco Patented Jan. 16, 1912.

gmve/wtoz 1 CHARLES H. CONGDON, or MARSHALLS CREEK, PENNSYLVANIA.

CHART-DISPLAY APPARATUS.

Specification of Letters Patent.

Patented Jan. 16,1912.

Application filed January 11, 1906. Serial No. 295,550.

To all whom it may concern.

Be it known that I, CHARLES H. Conc- DON, a citizen of the UnitedStates, residing at and whosepost-ofiice address is Marshalls Creek,Monroe county, Pennsylvania, have invented new and useful Improvementsin Chart-Display Apparatus, of which the following is a specification.

My invention relates to improvements in chart or map holders, its objectbeing to provide a simpleauto'matically acting device to whichthe chartor map may andbywhich it maybe supported whilebeing unwound for displayor educational work;

To this end, my invention-consists in the features of constructionhereinafter described and claimed.

In the accompanying part of-this specification, Figure 1 isan elevation,partly broken and partly in section, theutension or winding devices andchart roller; Fig. 2 is a detail of thestopmechanism for limitingthewinding and unwindingmovement of the spring roller to which the chartroller is attached; Fig. 3 is a cross-sectional view of Fig. 2v takenonthe dot and dash line; Fig. 4 is a detail of the end of the chartroller showing its means of detachable connection with the springroller.

For class instruction in the'school room by means of mechanical charts,maps or other'wall lessons, it is essential that'such chart or otherarticle he quickly setin place and extended along the wall and asquickly detached and put away and another substituted for it. It isfurther important that the chart be at all times under tension, whichwhen the chart is extended will hold it in proper position. It is alsodesirable that such wall lessons be imprinted on both sides of the chartfor economy in material, and in such case the winding apparatus must beadapted for opposite winding or rolling of the chart. For this purpose,I mount the chart upon a drum or roller of the ordinary type havinggudgeons at each end, said gudgeons being provided with means forengaging the spring tension device and turning the same when the roller.is actuated by the unrolling of the vice is similar to a tension springshade roller of well known t e, with the shaft of the rotating part of wich the gu on of be connected drawings forming of my improved apparatus,showing 3 in Figs. 1, 2, 3 and chart. The tension dethe chart roller maybe engaged. Interposed between the relatively fixed members of thetension device is provided an attachment traveling upon a screw carriedby one of'said parts and engaging with the other part, the screwcarrying part beingprovided with a stop adapted t6 be engaged by saidattachmentto limit its travel upon said screw and fix the limit ofrelaxing or minimum tension of the spring.

In :the drawings A represents a suitable frame orsupport adapted to befixed permanently to the wallet the room in the position-illustrated inFig. 1. This frame is provided with fittings 2 at the bottom to receivethe angular ends of the spring rollers B and "(Land at the upper endwith a bearing or journal fitting 6 to receive journals '7 of" theroller shafts. These described rotative and parts are'inclosed andprotected by means of a case or cover 8. At the top of the frame A isprovided another journal bracket 9 to receive the gudgeon 10 of theroller 11.

In the preferred ofthe ordinary Hartshorn shade roller type,

made-up of a hollow cylinder 12, journaled at its lower end on thenon-rotating stud 13, and containing a tension spiral spring 14, oneendof which is fixed to the stud 13, and the other to the plug 15, fixed inthe upper end of the cylinder. In this plug 15, or if preferred, inanother similar plug 16,-superimposed thereon, is inserted the gudgeonor journal shaft 7 preferablysecured therein as by means of screws 17passing through the cap 18 and entering the plug 16. The gudgeons 7 havea screw threaded portion 19. intermediate of the roller and the journaltip. Upon this screw threaded port-ion runs a'nut 20, having abifurcated arm 21 (see Figs. 2 and 3), which engages a guideconstruction illustratedv 4, the spring roller B is rod 22, preferablydnthe form of a long.

wire staple driven into the back of the case A. It will thus be seenthat the rotative movement of the upper end of the roller B will causethe nut to travel along the threads ed portion 19. The hub 23 of the gudeon is provided with a lug or shoulder 24, w ich is engaged by the nut20 in its travel toward the roller upon the screw and serves to stop therotative movement between the screw and nut, and hence to limit therotative movement of the roller B and the unwinding or relaxing of itsspring beyond the predetermined mini-- mum limit for the purposehereinafter the scribed. Similarly, the rotative-movement of the rolleris limited in the opposite direction by the impact of the nut 20, uponthe spur 54 on" the collar 55, fixed to the screw 19. Theimportance ofthese safety devices Will be hereinafter shown. The journal tip of thegudgeon 7 is preferably a cylinder with a diametric pin 25 fixedtherein, to re ceive and be engaged by the gudgeon 10 and the. chartroller 11, the end of which is provided with a diametric slot 26 whichreceives the pin 25 when the gudgeon 10 is inserted into the gudgeon 7,as illustrated in Fig. 1.

As for economical reasons these charts are preferably imprinted withmusical scores or other eductional matter on both sides, it is necessarythat oppositely winding tension devices be provided for displaying theopposite sides. In the preferred construction of Fig. 1 this. is securedby means of a tension roll Ghaving a spiral spring oppositely wound tothat of roll B, which construction being obvious is not shown. The chartroller is therefore fitted to either one of the I rollers B and C,according to the direction of winding and unwinding movement de terminedby the side of the chart which is to be displayed.

The manner of using the device is obvious from the foregoing descriptionand the drawings. slips'it into place upon that one of the fittin 5adapted to the direction in which the re] er turns as the chart isunwound. The ,free'end of the chart is then drawn out and attached tothe hooks 50,the tension of the spring of the roller B or C with whichthe chart is connected holding it extended and flat against the wall.'-After the chart has The teacher selects a chart and been used, it isdetached from the hooks 50 and rewound upon its roller under thetenturningof the parts after the chart has been fully wound, and holdingthe spring under initial or minimum tension, the parts being so adjustedthat the chart iitalways under suflicient tension to hold it in properposi tion. When the opposite side of the chart is to be used its rolleris fitted to the other tension device, the operation beingidenti- Ically the. same.

I claim: .1. In a chart display ap aratus, in combination, a screwthreaded s aft, a tension device connected to one end thereof foroperating the same, a coupling upon the other end of the shaft fordetachably connecting a chart carryingroll thereto, a nut threaded onsaid shaft, relatively fixed means for prewnting rotation of said nut,and a stop limiting the travel of said nut on saidshaft.

2. Ina chart display apparatus, in combination, a reversible chart, aroll for carrying same, a pair of driving shafts to either of which saidchart carrying roll can be detach ably connected so as to'be driventhereby,

said shafts having spring actuating means for operating them in oppositedirections,

and means upon said shafts for limiting their rotative movement.

Witness mv hand at the city of New York this 30th day of December, 1905.

CHARLES H CONGDON In presence. of HENRY W. CLARK,

